sys/dev/usb/hid.c

   1 /*      $NetBSD: hid.c,v 1.17 2001/11/13 06:24:53 lukem Exp $   */
   2
   3
   4 #include <sys/cdefs.h>
   5 __FBSDID("$FreeBSD$");
   6 /*-
   7  * Copyright (c) 1998 The NetBSD Foundation, Inc.
   8  * All rights reserved.
   9  *
  10  * This code is derived from software contributed to The NetBSD Foundation
  11  * by Lennart Augustsson (lennart@augustsson.net) at
  12  * Carlstedt Research & Technology.
  13  *
  14  * Redistribution and use in source and binary forms, with or without
  15  * modification, are permitted provided that the following conditions
  16  * are met:
  17  * 1. Redistributions of source code must retain the above copyright
  18  *    notice, this list of conditions and the following disclaimer.
  19  * 2. Redistributions in binary form must reproduce the above copyright
  20  *    notice, this list of conditions and the following disclaimer in the
  21  *    documentation and/or other materials provided with the distribution.
  22  * 3. All advertising materials mentioning features or use of this software
  23  *    must display the following acknowledgement:
  24  *        This product includes software developed by the NetBSD
  25  *        Foundation, Inc. and its contributors.
  26  * 4. Neither the name of The NetBSD Foundation nor the names of its
  27  *    contributors may be used to endorse or promote products derived
  28  *    from this software without specific prior written permission.
  29  *
  30  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  31  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  32  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  33  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  34  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  35  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  36  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  37  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  38  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  39  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  40  * POSSIBILITY OF SUCH DAMAGE.
  41  */
  42
  43 #include <sys/param.h>
  44 #include <sys/systm.h>
  45 #include <sys/malloc.h>
  46
  47 #include <dev/usb/usb.h>
  48 #include <dev/usb/usbhid.h>
  49
  50 #include <dev/usb/hid.h>
  51
  52 #ifdef USB_DEBUG
  53 #define DPRINTF(x)      if (usbdebug) printf x
  54 #define DPRINTFN(n,x)   if (usbdebug>(n)) printf x
  55 extern int usbdebug;
  56 #else
  57 #define DPRINTF(x)
  58 #define DPRINTFN(n,x)
  59 #endif
  60
  61 static void hid_clear_local(struct hid_item *);
  62
  63 #define MAXUSAGE 100
  64 struct hid_data {
  65         u_char *start;
  66         u_char *end;
  67         u_char *p;
  68         struct hid_item cur;
  69         int32_t usages[MAXUSAGE];
  70         int nu;
  71         int minset;
  72         int multi;
  73         int multimax;
  74         int kindset;
  75 };
  76
  77 static void
  78 hid_clear_local(struct hid_item *c)
  79 {
  80
  81         c->usage = 0;
  82         c->usage_minimum = 0;
  83         c->usage_maximum = 0;
  84         c->designator_index = 0;
  85         c->designator_minimum = 0;
  86         c->designator_maximum = 0;
  87         c->string_index = 0;
  88         c->string_minimum = 0;
  89         c->string_maximum = 0;
  90         c->set_delimiter = 0;
  91 }
  92
  93 struct hid_data *
  94 hid_start_parse(void *d, int len, int kindset)
  95 {
  96         struct hid_data *s;
  97
  98         s = malloc(sizeof *s, M_TEMP, M_WAITOK|M_ZERO);
  99         s->start = s->p = d;
 100         s->end = (char *)d + len;
 101         s->kindset = kindset;
 102         return (s);
 103 }
 104
 105 void
 106 hid_end_parse(struct hid_data *s)
 107 {
 108
 109         while (s->cur.next != NULL) {
 110                 struct hid_item *hi = s->cur.next->next;
 111                 free(s->cur.next, M_TEMP);
 112                 s->cur.next = hi;
 113         }
 114         free(s, M_TEMP);
 115 }
 116
 117 int
 118 hid_get_item(struct hid_data *s, struct hid_item *h)
 119 {
 120         struct hid_item *c = &s->cur;
 121         unsigned int bTag, bType, bSize;
 122         u_int32_t oldpos;
 123         u_char *data;
 124         int32_t dval;
 125         u_char *p;
 126         struct hid_item *hi;
 127         int i;
 128
 129  top:
 130         if (s->multimax != 0) {
 131                 if (s->multi < s->multimax) {
 132                         c->usage = s->usages[min(s->multi, s->nu-1)];
 133                         s->multi++;
 134                         *h = *c;
 135                         c->loc.pos += c->loc.size;
 136                         h->next = 0;
 137                         return (1);
 138                 } else {
 139                         c->loc.count = s->multimax;
 140                         s->multimax = 0;
 141                         s->nu = 0;
 142                         hid_clear_local(c);
 143                 }
 144         }
 145         for (;;) {
 146                 p = s->p;
 147                 if (p >= s->end)
 148                         return (0);
 149
 150                 bSize = *p++;
 151                 if (bSize == 0xfe) {
 152                         /* long item */
 153                         bSize = *p++;
 154                         bSize |= *p++ << 8;
 155                         bTag = *p++;
 156                         data = p;
 157                         p += bSize;
 158                         bType = 0xff; /* XXX what should it be */
 159                 } else {
 160                         /* short item */
 161                         bTag = bSize >> 4;
 162                         bType = (bSize >> 2) & 3;
 163                         bSize &= 3;
 164                         if (bSize == 3) bSize = 4;
 165                         data = p;
 166                         p += bSize;
 167                 }
 168                 s->p = p;
 169                 switch(bSize) {
 170                 case 0:
 171                         dval = 0;
 172                         break;
 173                 case 1:
 174                         dval = (int8_t)*data++;
 175                         break;
 176                 case 2:
 177                         dval = *data++;
 178                         dval |= *data++ << 8;
 179                         dval = (int16_t)dval;
 180                         break;
 181                 case 4:
 182                         dval = *data++;
 183                         dval |= *data++ << 8;
 184                         dval |= *data++ << 16;
 185                         dval |= *data++ << 24;
 186                         break;
 187                 default:
 188                         printf("BAD LENGTH %d\n", bSize);
 189                         continue;
 190                 }
 191
 192                 switch (bType) {
 193                 case 0:                 /* Main */
 194                         switch (bTag) {
 195                         case 8:         /* Input */
 196                                 if (!(s->kindset & (1 << hid_input))) {
 197                                         if (s->nu > 0)
 198                                                 s->nu--;
 199                                         continue;
 200                                 }
 201                                 c->kind = hid_input;
 202                                 c->flags = dval;
 203                         ret:
 204                                 if (c->flags & HIO_VARIABLE) {
 205                                         s->multimax = c->loc.count;
 206                                         s->multi = 0;
 207                                         c->loc.count = 1;
 208                                         if (s->minset) {
 209                                                 for (i = c->usage_minimum;
 210                                                      i <= c->usage_maximum;
 211                                                      i++) {
 212                                                         s->usages[s->nu] = i;
 213                                                         if (s->nu < MAXUSAGE-1)
 214                                                                 s->nu++;
 215                                                 }
 216                                                 s->minset = 0;
 217                                         }
 218                                         goto top;
 219                                 } else {
 220                                         *h = *c;
 221                                         h->next = 0;
 222                                         c->loc.pos +=
 223                                                 c->loc.size * c->loc.count;
 224                                         hid_clear_local(c);
 225                                         s->minset = 0;
 226                                         return (1);
 227                                 }
 228                         case 9:         /* Output */
 229                                 if (!(s->kindset & (1 << hid_output))) {
 230                                         if (s->nu > 0)
 231                                                 s->nu--;
 232                                         continue;
 233                                 }
 234                                 c->kind = hid_output;
 235                                 c->flags = dval;
 236                                 goto ret;
 237                         case 10:        /* Collection */
 238                                 c->kind = hid_collection;
 239                                 c->collection = dval;
 240                                 c->collevel++;
 241                                 *h = *c;
 242                                 hid_clear_local(c);
 243                                 s->nu = 0;
 244                                 return (1);
 245                         case 11:        /* Feature */
 246                                 if (!(s->kindset & (1 << hid_feature))) {
 247                                         if (s->nu > 0)
 248                                                 s->nu--;
 249                                         continue;
 250                                 }
 251                                 c->kind = hid_feature;
 252                                 c->flags = dval;
 253                                 goto ret;
 254                         case 12:        /* End collection */
 255                                 c->kind = hid_endcollection;
 256                                 c->collevel--;
 257                                 *h = *c;
 258                                 hid_clear_local(c);
 259                                 s->nu = 0;
 260                                 return (1);
 261                         default:
 262                                 printf("Main bTag=%d\n", bTag);
 263                                 break;
 264                         }
 265                         break;
 266                 case 1:         /* Global */
 267                         switch (bTag) {
 268                         case 0:
 269                                 c->_usage_page = dval << 16;
 270                                 break;
 271                         case 1:
 272                                 c->logical_minimum = dval;
 273                                 break;
 274                         case 2:
 275                                 c->logical_maximum = dval;
 276                                 break;
 277                         case 3:
 278                                 c->physical_minimum = dval;
 279                                 break;
 280                         case 4:
 281                                 c->physical_maximum = dval;
 282                                 break;
 283                         case 5:
 284                                 c->unit_exponent = dval;
 285                                 break;
 286                         case 6:
 287                                 c->unit = dval;
 288                                 break;
 289                         case 7:
 290                                 c->loc.size = dval;
 291                                 break;
 292                         case 8:
 293                                 c->report_ID = dval;
 294                                 break;
 295                         case 9:
 296                                 c->loc.count = dval;
 297                                 break;
 298                         case 10: /* Push */
 299                                 hi = malloc(sizeof *hi, M_TEMP, M_WAITOK);
 300                                 *hi = s->cur;
 301                                 c->next = hi;
 302                                 break;
 303                         case 11: /* Pop */
 304                                 hi = c->next;
 305                                 oldpos = c->loc.pos;
 306                                 s->cur = *hi;
 307                                 c->loc.pos = oldpos;
 308                                 free(hi, M_TEMP);
 309                                 break;
 310                         default:
 311                                 printf("Global bTag=%d\n", bTag);
 312                                 break;
 313                         }
 314                         break;
 315                 case 2:         /* Local */
 316                         switch (bTag) {
 317                         case 0:
 318                                 if (bSize == 1)
 319                                         dval = c->_usage_page | (dval&0xff);
 320                                 else if (bSize == 2)
 321                                         dval = c->_usage_page | (dval&0xffff);
 322                                 c->usage = dval;
 323                                 if (s->nu < MAXUSAGE)
 324                                         s->usages[s->nu++] = dval;
 325                                 /* else XXX */
 326                                 break;
 327                         case 1:
 328                                 s->minset = 1;
 329                                 if (bSize == 1)
 330                                         dval = c->_usage_page | (dval&0xff);
 331                                 else if (bSize == 2)
 332                                         dval = c->_usage_page | (dval&0xffff);
 333                                 c->usage_minimum = dval;
 334                                 break;
 335                         case 2:
 336                                 if (bSize == 1)
 337                                         dval = c->_usage_page | (dval&0xff);
 338                                 else if (bSize == 2)
 339                                         dval = c->_usage_page | (dval&0xffff);
 340                                 c->usage_maximum = dval;
 341                                 break;
 342                         case 3:
 343                                 c->designator_index = dval;
 344                                 break;
 345                         case 4:
 346                                 c->designator_minimum = dval;
 347                                 break;
 348                         case 5:
 349                                 c->designator_maximum = dval;
 350                                 break;
 351                         case 7:
 352                                 c->string_index = dval;
 353                                 break;
 354                         case 8:
 355                                 c->string_minimum = dval;
 356                                 break;
 357                         case 9:
 358                                 c->string_maximum = dval;
 359                                 break;
 360                         case 10:
 361                                 c->set_delimiter = dval;
 362                                 break;
 363                         default:
 364                                 printf("Local bTag=%d\n", bTag);
 365                                 break;
 366                         }
 367                         break;
 368                 default:
 369                         printf("default bType=%d\n", bType);
 370                         break;
 371                 }
 372         }
 373 }
 374
 375 int
 376 hid_report_size(void *buf, int len, enum hid_kind k, u_int8_t *idp)
 377 {
 378         struct hid_data *d;
 379         struct hid_item h;
 380         int hi, lo, size, id;
 381
 382         id = 0;
 383         hi = lo = -1;
 384         for (d = hid_start_parse(buf, len, 1<<k); hid_get_item(d, &h); )
 385                 if (h.kind == k) {
 386                         if (h.report_ID != 0 && !id)
 387                                 id = h.report_ID;
 388                         if (h.report_ID == id) {
 389                                 if (lo < 0)
 390                                         lo = h.loc.pos;
 391                                 hi = h.loc.pos + h.loc.size * h.loc.count;
 392                         }
 393                 }
 394         hid_end_parse(d);
 395         size = hi - lo;
 396         if (id != 0) {
 397                 size += 8;
 398                 *idp = id;      /* XXX wrong */
 399         } else
 400                 *idp = 0;
 401         return ((size + 7) / 8);
 402 }
 403
 404 int
 405 hid_locate(void *desc, int size, u_int32_t u, enum hid_kind k,
 406            struct hid_location *loc, u_int32_t *flags)
 407 {
 408         struct hid_data *d;
 409         struct hid_item h;
 410
 411         for (d = hid_start_parse(desc, size, 1<<k); hid_get_item(d, &h); ) {
 412                 if (h.kind == k && !(h.flags & HIO_CONST) && h.usage == u) {
 413                         if (loc != NULL)
 414                                 *loc = h.loc;
 415                         if (flags != NULL)
 416                                 *flags = h.flags;
 417                         hid_end_parse(d);
 418                         return (1);
 419                 }
 420         }
 421         hid_end_parse(d);
 422         loc->size = 0;
 423         return (0);
 424 }
 425
 426 u_long
 427 hid_get_data(u_char *buf, struct hid_location *loc)
 428 {
 429         u_int hpos = loc->pos;
 430         u_int hsize = loc->size;
 431         u_int32_t data;
 432         int i, s;
 433
 434         DPRINTFN(10, ("hid_get_data: loc %d/%d\n", hpos, hsize));
 435
 436         if (hsize == 0)
 437                 return (0);
 438
 439         data = 0;
 440         s = hpos / 8;
 441         for (i = hpos; i < hpos+hsize; i += 8)
 442                 data |= buf[i / 8] << ((i / 8 - s) * 8);
 443         data >>= hpos % 8;
 444         data &= (1 << hsize) - 1;
 445         hsize = 32 - hsize;
 446         /* Sign extend */
 447         data = ((int32_t)data << hsize) >> hsize;
 448         DPRINTFN(10,("hid_get_data: loc %d/%d = %lu\n",
 449                     loc->pos, loc->size, (long)data));
 450         return (data);
 451 }
 452
 453 int
 454 hid_is_collection(void *desc, int size, u_int32_t usage)
 455 {
 456         struct hid_data *hd;
 457         struct hid_item hi;
 458         int err;
 459
 460         hd = hid_start_parse(desc, size, hid_input);
 461         if (hd == NULL)
 462                 return (0);
 463
 464         err = hid_get_item(hd, &hi) &&
 465             hi.kind == hid_collection &&
 466             hi.usage == usage;
 467         hid_end_parse(hd);
 468         return (err);
 469 }